×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Load factors AS 5100

Load factors AS 5100

Load factors AS 5100

(OP)
Hi all,

Can someone explain to me what's the application of using load factors when safety increased or decreased. How we can determine if the dead load increases/decreases safety?
Besides, what 'site specific measurements' implies?
Cheers,




Shoot for the Moon, even if U miss, U still land among Stars!

RE: Load factors AS 5100

If you have an uplift wind load, then a downwards dead load is increasing safety and should have a lower ULS factor for that particular load case.

RE: Load factors AS 5100

Or for a cantilevered beam; dead load on the cantilever reduces safety while on the backspan it increases safety.

RE: Load factors AS 5100

(OP)
Thanks for clarifications, so in case of moving load then it reduces safety.
Also does "site specific measurements" means that we've obtained the geometrical measurement from the site and did the DL calculation?

Shoot for the Moon, even if U miss, U still land among Stars!

RE: Load factors AS 5100

No, it reduces safety at a point it it causes a moments of opposite sign to the moving load at that point.

RE: Load factors AS 5100

Which version of AS 5100 is that table from? The load factors are in Tables 5.2 and 5.3 in the 2004 version, and Tables 6.2 and 6.3 in the current recently released version. They don't have the "site-specific measurement" columns.

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

RE: Load factors AS 5100

(OP)

Quote (rapt)

Do you mean the +ve n -ve moment due to ML? Since the direction of ML is downward and also DL is in gravity direction, then it reduces safety; if I understand you correctly.

Quote (IDS)


This is from AS 5100.7:2017 page 25 section 12.2

Shoot for the Moon, even if U miss, U still land among Stars!

RE: Load factors AS 5100

Shz713 - AS 5100 Part 7 is for load rating of existing bridges. So if the estimated weights of the elements of the bridge are based on a survey of the actual bridge the load factors can be closer to 1, which seems reasonable.

The load factors for new bridges are given in Part 2.

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close